/Engine/Source/Editor/UMGEditor/Public/DesignerExtension.h
Called to paint the extension.
virtual void Paint ( const [TSet](API\Runtime\Core\Containers\TSet)< [FWidgetReference](API\Editor\UMGEditor\FWidgetReference) > & Selection, const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) & AllottedGeometry, const [FSlateRect](API\Runtime\SlateCore\Layout\FSlateRect) & MyCullingRect, [FSlateWindowElementList](API\Runtime\SlateCore\Rendering\FSlateWindowElementList) & OutDrawElements, int32 LayerId ) const